Raw Materials Used To Produce Clinker And Cement In The United States

TABLE 6
RAW MATERIALS USED TO PRODUCE CLINKER AND CEMENT IN THE UNITED STATES- ^{1, 2}

(Thousand metric tons)

	2009		2010
-Materials	Clinker	Cement³	Clinker	Cement³
Calcareous:
Limestone (aragonite, chalk, coral, marble)	73,600	1,510	78,500	1,550
Cement rock (includes marl)	6,560	---	7,500	30
Cement kiln dust (CKD)⁴	288	156	256	141
Lime⁴	17	5	20	17
Other	62	---	47	13
Aluminous:
Clay	2,500	3	2,830	---
Shale and schist	2,540	---	2,370	13
Other⁵	438	---	478	---
Ferrous:
Iron ore	481	---	501	---
Mill scale	536	---	522	---
Other⁶	40	---	19	---
Siliceous:
Sand, calcium silicates	2,550	---	2,830	---
Sandstone, quartzite, soils, nonpozzolanic rocks	464	---	506	---
Fly ash	2,290	74	2,430	85
Other ash, including bottom ash	706	---	727	---
Granulated blast furnace slag⁷	44	192	70	235
Other blast furnace slag	99	---	30	---
Steel slag	169	---	238	---
Other slag	38	---	165	2
Natural rock pozzolans⁸	---	11	---	20
Other pozzolans⁹	45	3	9	1
Other:
Gypsum and anhydrite	(10)	3,367	(10)	3,550
Other¹¹	79	57	62	61
Total¹²	93,600	5,380	100,000	5,720
Clinker, imported, raw materials equivalent¹³	---	1,250	---	1,190
Grand total¹²	93,600	6,630	100,000	6,910
-- Zero.
¹Excludes Puerto Rico.
²Data have been rounded to three significant digits to reflect inherent reporting accuracy and the incorporation of estimates for some facilities.
³Includes portland, blended, and masonry cements.
⁴Data are probably underreported.
⁵Includes alumina, aluminum dross, bauxite, spent catalysts, and other aluminous materials.
⁶Includes iron sludges, pyrite, and other ferrous materials.
⁷Includes both ground (GGBFS) and unground material.
⁸Includes pozzolana and burned clays or shales (except where directly reported as clay or shale).
⁹Includes diatomite, silica fume, other microcrystalline silica, and other pozzolans, even if not used as such.
¹⁰Included with Calcareous: Other.
¹¹Includes fluorspar and all other materials not listed earlier.
¹²Data may not add to totals shown because of independent rounding.
¹³Converted as 1.7 times the weight of foreign clinker consumed.